Machine for grinding or cutting toothed gear wheels or other analogous objects



April 29, 1930. v A. H. ORCUTT ET AL 1,756,876

MACHINE FOR GRINDING OR CUTTING T-OOTHED GEAR WHEELS OR OTHER ANALOGOUS OBJECTS Filed Jan 16, 1929 3 Sheets-Sheet l H rr ,Z'irvenbra:

MACHINE FOR GRINDING OR CUTTING TOOTHED GEAR WHEELS OR OTHER ANALOGOUS OBJECTS Filed Jan. 16, 1929 5 Sheets-Sheet 2 April 29, 1930. TT ET AL 1,756,876

April 29, 1930. H' ORCUTT ET AL 1,756,876

MACHINE FOR GRINDING OR CUTTING TOOTHED GEAR WHEELS OR OTHER ANALOGOUS OBJECTS F'iled Jan. 16. 1929 3 Sheets-Sheet j chines for Patented Apr. 29 1930 UNITED STATES PATENT OFFICEV- ARTHUR HITCHCOCK OBGUTT ANDE JOHN WILDSMITH SNARRY, F IBIRMmGm,

ENGLAND, ASSIGNORS TO THE AGEAB GRINDING COMPANY LIMITED, OF BIRMING- HAM, ENGLAND MACHINE FOB- DING OB CUTTING TOO'IQHED GEAR WHEELS OR OTHER ANALOGOUB' Application filed January 16, 1929, Serial No. 332,964, and in Great Britain January 84, i928.

This invention relates primaril to mainding toothed gear w eels, but is applica le to other kindred machines. .Hitherto the work piece has usually been mounted on a horizontal axis, and a rotating grinding wheel has been arranged to reciprocate in a horizontal plane. When dealing with large work pieces, it is convenient to mount the work iece on a vertical axis and arrange the grinding wheel to reciprocate in a vertical plane. This chan e in the disposition of the parts involves, owever, certain difiiculties which it is the object of this invention to overcome. Where a high order of precision is required in the work piece, 1t is necessary intermittently to trim the grmdmg wheel in order to maintain the accuracy of its form, and when, as is now contemplated, it is required to reciprocate the grinding wheel in a vertical direction, it is convenient to arrange the trimming mechanism to act on the side of the wheel op ite to that which comes into contact with t e work piece. Formerly it has been unnecessary to compensate for the reduction of diameter of the grind- 80 The invention comprises the correlation of.

ing wheel resulting from the trimming action, but with the arrangement here n described, some compensating mechanism is necessary.

the feed mechanism whereby the work piece is advanced towards the grindin wheel in a direction at right angles to the ine of reciprocation of the said wheel, and the feed mechanism whereby the trimming tool or.

tools is or are advanced towards the inding wheel, by means of mechanism w ich includes a pair of relativel movable and preferably graduated parts y which an indication is given to the attendant of the movements imparted to the two feed mechanisms.

:In the three accompanying sheets of explanatory drawings Figure 1 is a side elevation of a toothed wheel grinding machine provided with this invention.

Figures 2 and 3 are respectively-sectional end elevation and sectional side elevation showing to a larger scale than Figure 1 mechanisms constructed in accordancewith this invention for adjusting the positions, of the work piece and grinding wheel.-

In carrying the invention into effect as shown, the lower portion of the bed a of the can be reciprocated relatively to the work piece. On the frame of the machine adjacent to that side of the grinding wheel opposite the portion which acts on the work piece, are arranged any suitable trimming tools z. Only one tool appears in the drawing, but it will be understood that there are a pair of tools situated one behind the other and actin wheel. he trimming tools are operated by any suitable means, but these are not shown in the drawing.

The feed mechanism which advances the trimming tools towards the grinding wheel is actuated by a hand operated rotatable spindle j which is preferably arranged in a vertical position. At its upper end the spindle carries a worm is engaging a worm on opposite faces of the grinding wheel I which rotates a screw m engaging a i shaft to which operates a screw and not feed mechanism (not shown) whereby the slide 6 carrying the work piece can be moved in a horizontal direction on the bed of the 'machine. The shaft 'w is actuated by hand through worm a: and wheel y.

When the attendant by means of the handle a imparts'a feed movement to the trimming mechanism the graduated disc 9* connected to this mechanismis moved relatively to the adjacent disc 8, and the graduations on the two discs indicate to the attendant the amount of feed movement which has been given. Such movement corresponds to a reduction in di' ameter of the grinding wheel, and consequently before the next feed movement is imparted to the work piece a movement must be 10 imparted through the other feed mechanism by manipulation of the handle 2 sufiicient to bring the markings on the two discs into the original condition of coincidence. Movement in excess of this is the useful feed movement which is imparted to the work piece, and

this is indicated by the disc 8.

lVhilst we have described the application of our invention to a gear wheel grinding machine, it will be apparent that it is apphcable to other analogous machines, and subordinate details can be varied to suit different requirements.

Having thus described our invention what we claim as new and desire to secure by Letters Patent is A v 1. In machines for grinding toothed gear wheels or similar objects, the combination comprising a rotary grinding wheel, a reciprocat'ory slide on which the said wheel is mounted, a work carrying slide movable in a direction at right angles to the direction of motion of the slide carrying the. grinding wheel, means for imparting feed movements to the work carrying slide, a trimming tool, a

slide carrying the trimming tool, means for imparting feed movementsof the slide carrying the trimming tool, and means for correlating the: two feed movements, substantially as described.

2. In mechanisms for grinding toothed gear wheels or similar objects, the combination comprising a rotary grinding wheel, a reciprocatory slide on which the said wheel is mounted, a work carrying slide movable 4 in a direction at right angles to the direction of motion of the slide carrying the grinding wheel, a feed mechanism acting on the work carrying slide,a trimming tool, a slide carrying the trimmin tool and movable in a direction parallel wit the feed motion of the work carrying sIide, a feed mechanism acting on the slide carrying the trimming tool, a pair of coaxial rotary indicating members, either or both of which is graduated, and actuating means connecting the said'members to the respective feed mechanisms, substantially as described.

In testimony whereof we have signed our names to this specification. I

" ARTHUR HITCHCOCK ORCUTT.

JOHN WILDSMITH SNARRY; 

